On 15/04/16 20:29, Dong Aisheng wrote:
> Currently, we config the watermark_level register only in probe.
> This will cause the mmc write operation timeout issue after system
> resume back in LPSR mode. Because in LPSR mode, after system resume
> back, the watermark_level register(0x44) changes to 0x08000880, which
> set the write watermark level as 0, and set the read watermark level
> as 128. This value is incorrect.
>
> This patch restores the setting of watermark level register after
> system resume back.
In sdhci_esdhc_imx_probe() the watermark setting is conditional on
esdhc_is_usdhc(imx_data), but in the resume it is not. Is that intended?
If so, maybe explain that in the commit message.
Might be worth pulling out the constant 0x10401040 and #defining it since it
is used in more than one place too.
>
> Signed-off-by: Dong Aisheng <aisheng.dong@xxxxxxx>
> ---
> drivers/mmc/host/sdhci-esdhc-imx.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 6fef6bc..4c28fbb 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -1261,6 +1261,11 @@ static int sdhci_esdhc_suspend(struct device *dev)
>
> static int sdhci_esdhc_resume(struct device *dev)
> {
> + struct sdhci_host *host = dev_get_drvdata(dev);
> +
> + /* restore watermark setting in case it's lost in low power mode */
> + writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> +
> return sdhci_pltfm_resume(dev);
> }
>
>
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